Revert "Remove CodecInst pt.1"

This reverts commit 056f9738bf7a3d16da45398239656e165c4e0851.

Reason for revert: breaks downstream

Original change's description:
> Remove CodecInst pt.1
> 
> Update audio_coding tests to not use CodecInst.
> 
> Bug: webrtc:7626
> Change-Id: I880fb8d72d7d0a915d274e67feb6106f023697c2
> Reviewed-on: https://webrtc-review.googlesource.com/c/112594
> Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#25879}

TBR=solenberg@webrtc.org,kwiberg@webrtc.org

Change-Id: I51d666969bcd63e2b7cb7d669ec2f59b5f8f9dde
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:7626
Reviewed-on: https://webrtc-review.googlesource.com/c/112906
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25881}
diff --git a/modules/audio_coding/test/TestVADDTX.cc b/modules/audio_coding/test/TestVADDTX.cc
index 8e16280..09c69f9 100644
--- a/modules/audio_coding/test/TestVADDTX.cc
+++ b/modules/audio_coding/test/TestVADDTX.cc
@@ -23,8 +23,8 @@
 #include "api/audio_codecs/opus/audio_encoder_opus.h"
 #include "modules/audio_coding/codecs/cng/audio_encoder_cng.h"
 #include "modules/audio_coding/test/PCMFile.h"
+#include "modules/audio_coding/test/utility.h"
 #include "rtc_base/strings/string_builder.h"
-#include "test/gtest.h"
 #include "test/testsupport/fileutils.h"
 
 namespace webrtc {
@@ -94,9 +94,8 @@
   channel_->SetIsStereo(encoder->NumChannels() > 1);
   acm_send_->SetEncoder(std::move(encoder));
 
-  std::map<int, SdpAudioFormat> receive_codecs = {{payload_type, codec_format}};
-  acm_receive_->SetReceiveCodecs(receive_codecs);
-
+  EXPECT_EQ(true,
+            acm_receive_->RegisterReceiveCodec(payload_type, codec_format));
   return added_comfort_noise;
 }